Speaker



FIG. 1 is an isometric view of a speaker;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is an elevation view thereof from the left side, the right side being a mirror image thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The portions of the speaker shown in broken lines form no part of the claimed design. 

CLAIM The ornamental design for a speaker, as shown and described. 